"I liked it, but I couldn't use it from the movie," Fiona said. "I spent literally the next year trying to recreate that sound. I went to San Francisco for Halloween and I was hanging out in trolleys recording people screaming. I would walk past a bunch of drunk people and be like: 'Hey, scream!' But it would always sound wrong and stupid."

But at the eleventh hour she struck gold:

"But on the first morning we were planning to record, I had just gotten out of the shower and I heard all these kids screaming-- there's an elementary school across from my house in L.A. I was like, 'Oh shit, that's it.' I threw on whatever was right there-- which I didn't realize at the time was a pair of pants that I was going to throw away because the ass was split-- and I ran out, half-clothed, carrying my recording thing. I was standing there looking like a crazy person, watching these kids. They were jumping with balloons between their legs, trying to make them pop. In the actual song, we had to take out all the balloon pops because they sounded like gunshots. But it was so perfect."

So there you have it. Listen closely for the aforementioned sample at about 2:10 in the track, above.

For much, much more about The Idler Wheel, and much, much more, read the rest of the interview.